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Power Scale pot sweep
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With Kevin's assistance, I was able to install the Power Scaling kit (RBX and SV1) into my Marshall JVM HJS.
Now I no longer need a Power Soak to blast it at bedroom levels or feed my Two Notes Torpedo Live without overheating the Torpedo.
We converted my Master Volume (1 and 2) controls into Power Scale controls.
He even helped me fix a bad PPIMV design with a better one with an added relay so I can have separate Drive Compensators for Master Volume 1 and Master Volume 2.
Switching is dead silent and instantaneous!
I have one set as a "clean" Power Scale and the other set to overdrive the Output tubes since 100 Watt Marshalls are designed to stay clean.

As for the Power Scaling pot sweep, for my particular configuration, I can start to hear the amp at about 9 o'clock (or a volume of 2).
A volume of 3 is very comfortable for bedroom playing and wouldn't disturb anyone else in the house.
But the TONE is very much THERE!!

Thank you, Kevin, for all your help!!

   
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Messages In This Thread
Power Scale pot sweep - by K O'Connor - 02-05-2024, 02:28 PM
RE: Power Scale pot sweep - by K O'Connor - 05-28-2024, 12:57 PM
RE: Power Scale pot sweep - by RockmanCentralBob - 04-15-2025, 11:05 AM
RE: Power Scale pot sweep - by K O'Connor - 04-16-2025, 12:35 PM

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Come in where it's warm!
A warm welcome to tube amp modding fans and those interested in hi-fi audio! Readers of Kevin O'Connor's The Ultimate Tone (TUT) book series form a part of our population. Kevin O'Connor is the creator of the popular Power Scaling methodology for amplifiers.
Please remember these three principles: respect, sharing, community.
Not familiar with The Ultimate Tone book series? See discussion topics, or click here to visit London Power/Power Press Publishing.

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